67 (number)

← 66 68 → 67
← 60 61 62 63 64 65 66 67 68 69 → List of numbers — Integers 0 10 20 30 40 50 60 70 80 90 →
Cardinal	sixty-seven
Ordinal	67th (sixty-seventh)
Factorization	prime
Divisors	1, 67
Roman numeral	LXVII
Binary	10000112
Octal	1038
Duodecimal	5712
Hexadecimal	4316

67 (sixty-seven) is the natural number following 66 and preceding 68. It is an odd number.

In mathematics

Sixty-seven is the 19th prime number (the next is 71), an irregular prime, a lucky prime, the sum of five consecutive primes (7 + 11 + 13 + 17 + 19), and a Heegner number.

Since 18! + 1 is divisible by 67 but 67 is not one more than a multiple of 18, 67 is a Pillai prime.

In a Voronoi diagram created using points from the prime spiral, no prime less than 10242 will have a rounder Voronoi cell than 67.

In science

• The atomic number of holmium, a lanthanide

Astronomy

• Messier object M67, a magnitude 7.5 open cluster in the constellation Cancer
• The New General Catalogue object NGC 67, an elliptical galaxy in the constellation Andromeda
• The Saros number of the solar eclipse series which began on -727 February 20 and ended on 571 April. The duration of Saros series 67 was 1298.1 years, and it contained 73 solar eclipses. The Saros number of the lunar eclipse series which began on -660 July 1 and ended on 656 September. The duration of Saros series 67 was 1316.2 years, and it contained 74 lunar eclipses.

In Music

Rap

• Rapper Tech N9ne claims to be "All 6's and 7's" explaining that 6 is evil and 7 is godly.
• Rapper Lil Wayne released a music video for the song "6 Foot 7 Foot" (shortened as 6'7') in 2011 where he borrows a scene from the film Inception.

Other fields

Sixty-seven is:

• The registry of the U.S. Navy's aircraft carrier USS John F. Kennedy (CV-67), named after U.S. President John F. Kennedy
• The number of the European route E67, the Via Baltica from Prague to Helsinki
• The number of the French department Bas-Rhin
• Chicago's song "Questions 67 and 68"
• Elton John's song "Old '67" on The Captain & The Kid CD, (2006)
• The number of counties in Florida
• The number of counties in Alabama
• The number of counties in Pennsylvania
• The highest two-digit odd number not presently designating any highway in the Interstate Highway System of the United States.
• In the US, *67 is a common prefix-code for blocking caller-id info on the subsequent call.

In sports

• Buddy Arrington's best-known NASCAR car number
• The Ottawa 67's, founded in 1967
• The number of throws in Judo.
• Pekka Koskela skated the 1000 metres in 1:07:00 (67 seconds) on 10 November 2007, a world record at the time.

Historical years

67 A.D., 67 B.C., 1967, 2067, etc.

External links

• A short journey involving 67s:
• http://www.dr-mikes-maths.com/psv/index.html